Suppose x varies inversely as y, y varies directly as the square of t and x = 1, when t = 3. Find x when t = \(\frac{1}{3}\).
Trả lời
(A)
81
2
If sine x equals cosine x, what is x in radians?
Trả lời
(C)
\(\frac{\pi}{4}\)
3
The ratio of the price of a loaf of bread to the price of a packet of sugar in 1975 was r : t. In 1980, the price of a loaf went up by 25% and that of a packet of sugar went up by 10%. Their new ratio is now
Trả lời
(C)
50r : 44t
4
Find a two-digit number such that three times the tens digit is 2 less than twice the units digit and twice the number is 20 greater than the number obtained by reversing the digits
Trả lời
(D)
47
5
Find the value of x satisfying \(\frac{x}{2}\) - \(\frac{1}{3}\) < \(\frac{2x}{5}\) + \(\frac{1}{6}\)
Trả lời
(A)
x < 5
6
A group of 14 children children received the following scores in a reading test: 35, 35, 26, 26, 26, 29, 29, 29, 12, 25, 25, 25, 25, 17. What was the median score?
Trả lời
(B)
26
7
Which of the following fractions is less than one-third?
Trả lời
(C)
\(\frac{15}{46}\)
8
A cuboid has a diagonal of length 9cm and a square base of side 4cm. What is its height?
Trả lời
(B)
\(\sqrt{65}\)cm
9
Evaluate correct to 4 decimal places 827.51 x 0.015
Trả lời
(B)
12.4127
10
What is the area between two concentric circles of diameters 26cm and 20cm?
Trả lời
(C)
69\(\pi\)
11
Marks scored by some children in an arithmetic test are:5, 3, 6, 9, 4, 7, 8, 6, 2, 7, 8, 4, 5, 2, 1, 0, 6, 9, 0, 8.
The arithmetic mean of the marks is
Trả lời
(B)
5
12
The weights of 30 new-born babies are given as follow: 6, 9, 5, 7, 6, 7, 5, 8, 9, 5, 7, 5, 8, 7, 8, 7, 5, 6, 5, 7, 6, 9, 9, 7, 8, 8, 7, 8, 9, 8. The mode is
Trả lời
(D)
7
13
If \(\sin x° = \frac{a}{b}\), what is \(\sin (90 - x)°\)?
Trả lời
(A)
\(\frac{\sqrt{b^2 - a^2}}{b}\)
14
7 pupils of average age 12 years leave a class of 25 pupils of average age 14 years. If 6 new pupils of average age 11years join the class, what is the average age of the pupils now in the class?
Trả lời
(D)
13 years 10 months
15
A sum of money invested at 5% per annum simple interest amounts to $285.20 after 3 years. How long will it take the same sum to amount to $434.00 at 7\(\frac{1}{2}\)% per annum simple interest?
Trả lời
(B)
10 years
16
By selling an article for N45.00 a man makes a profit of 8%. For how much should he have sold it in order to make a profit of 32%?
Trả lời
(E)
N55.00
17
An isosceles triangle of sides 13cm, 13cm, 10cm is inscribed in a circle. What is the radius of the circle?
Trả lời
(A)
7cm
18
A micrometer is defined as one millionth of a millimeter. A length of 12,000 micrometres may be represented as
Trả lời
(C)
0.000012m
19
In one and a half hours, the minute hand of a clock rotates through an angle of
In \(\bigtriangleup\)XYZ, XY = 3cm, XZ = 5cm and YZ = 7cm. If the bisector of XYZ meets XZ at W, what is the length of XW?
Trả lời
(A)
1.5cm
23
If \(\log_{2} y = 3 - \log_{2} x^{\frac{3}{2}}\), find y when x = 4.
Trả lời
(E)
1
24
Given that 10\(^x\) = 0.2 and log\(_{10}\)2 = 0.3010, find x
Trả lời
(B)
-0.6990
25
Two cars X and Y start at the same point and travel towards a point P which is 150km away. If the average speed of Y is 60km per hour and x arrives at P 25 minutes earlier than Y. What is the average speed of X?
The number 25 when converted from the tens and units base to the binary base (base two) is one of the following
Trả lời
(D)
11001
28
Evaluate \(\frac{6.3 \times 10^5}{8.1 \times 10^3}\) to 3 significant fiqures
Trả lời
(A)
77.80
29
The positive root of t in the following equation, 4t2 + 7t - 1 = 0, correct to 4 places of decimal, is
Trả lời
(C)
0.1328
30
The difference between the length and width of a rectangle is 6cm and the area is 135cm2. What is the length?
Trả lời
(C)
15cm
31
The area of a circular plate is one-sixteenth the surface area of a ball of a ball, If the area of the plate is given as P cm2, then the radius of the ball is
Trả lời
(D)
2\(\frac{P}{\pi}\)
32
Show that \(\frac{\sin 2x}{1 + \cos x}\) + \(\frac{sin2 x}{1 - cos x}\) is
Trả lời
(C)
2
33
The first term of an Arithmetic progression is 3 and the fifth term is 9. Find the number of terms in the progression if the sum is 81
Trả lời
(C)
9
34
Simplify T = \(\frac{4R_2}{R_1^{-1} + R_2^{-1} + 4R_3^{-1}}\)
If b = a + cp and r = ab + \(\frac{1}{2}\)cp2, express b\(^2\) in terms of a, c, r.
Trả lời
(E)
b2 = 2cr - a2
36
Multiply x2 + x + 1 by x2 - x + 1
Trả lời
(C)
x4 + x2 + 1
37
A baking recipe calls for 2.5kg of sugar and 4.5kg of flour. With this recipe some cakes were baked using 24.5kg of a mixture of sugar and flour. How much sugar was used?
Trả lời
(C)
8.75kg
38
The difference between 4\(\frac{5}{7}\) and 2\(\frac{1}{4}\) is greater than sum of \(\frac{1}{14}\) and 1\(\frac{1}{2}\) by
Trả lời
(C)
\(\frac{50}{56}\)
39
What is the size of an exterior angle of a regular pentagon?
Trả lời
(C)
72o
40
The sum of the root of a quadratic equation is \(\frac{5}{2}\) and the product of its root is 4. The quadratic equation is
Trả lời
(B)
2x2 - 5x + 8 = 0
41
Solve the given equation \((\log_{3} x)^{2} - 6(\log_{3} x) + 9 = 0\)
Trả lời
(A)
27
42
What is the length of an arc of a circle that substends 2\(\frac{1}{2}\) radians at the centre when the raduis of the circle = \(\frac{k}{k + 1}\) + \(\frac{k + 1}{k}\) then
Trả lời
(E)
p > 0
43
In the figure, the chords XY and ZW are produced to meet at T such that YT = WT, ZYW = 40o and YTW = 30o. What is YXW?
